'use strict'
const path = require('path')
function resolve(dir) {
  return path.join(__dirname, dir)
}

const name = 'vue3'

const port = process.env.port || process.env.npm_config_port || 9529
const cdn = {
  css: [
    'https://unpkg.com/element3/lib/theme-chalk/index.css'
  ],
  js: [
    'https://unpkg.com/vue@next',
    'https://unpkg.com/element3',
  ]
};
module.exports = {
  publicPath: './',
  outputDir: 'dist',
  assetsDir: 'static',
  lintOnSave: process.env.NODE_ENV === 'development',
  productionSourceMap: false,
  devServer: {
    port: port,
    open: true,
    overlay: {
      warnings: false,
      errors: true
    },
    // proxy: {
    //   '/api': {
    //     target: `http://127.0.0.1:8000/`,
    //     changeOrigin: true,
    //     pathRewrite: {
    //       '^/api': '' // 思路是如果是开发环境，就给所有要代理的接口统一加上前缀，然后代理请求时再统一通过rewrite去掉
    //     }
    //   }
    // },
    before: require('./mock/mock-server.js')
  },
  configureWebpack: (config) => {
    config.name = name
    config.resolve.alias = {
      '@': resolve('src')
    }
    if (process.env.NODE_ENV !== 'development') {
      config.externals = {
        vue: 'Vue',
        element3: 'Element3'
      }
    }
    //  name: name
    // resolve: {
    //   alias: {
    //     '@': resolve('src')
    //   }
    // },
    // externals: {
    //   vue: 'Vue',
    //   element3: 'Element3'
    // }

  },
  chainWebpack(config) {
    config.plugins.delete('preload') // TODO: need test
    config.plugins.delete('prefetch') // TODO: need test

    // set svg-sprite-loader
    config.module
      .rule('svg')
      .exclude.add(resolve('src/icons'))
      .end()
    config.module
      .rule('icons')
      .test(/\.svg$/)
      .include.add(resolve('src/icons'))
      .end()
      .use('svg-sprite-loader')
      .loader('svg-sprite-loader')
      .options({
        symbolId: 'icon-[name]'
      })
      .end()


    config
      // https://webpack.js.org/configuration/devtool/#development
      .when(process.env.NODE_ENV === 'development',
        config => config.devtool('cheap-source-map')
      )

    config
      .when(process.env.NODE_ENV !== 'development',
        config => {
          config
            .plugin('ScriptExtHtmlWebpackPlugin')
            .after('html')
            .use('script-ext-html-webpack-plugin', [{
              // `runtime` must same as runtimeChunk name. default is `runtime`
              inline: /runtime\..*\.js$/
            }])
            .end()
          config
            .optimization.splitChunks({
              chunks: 'all',
              cacheGroups: {
                libs: {
                  name: 'chunk-libs',
                  test: /[\\/]node_modules[\\/]/,
                  priority: 10,
                  chunks: 'initial' // only package third parties that are initially dependent
                },
                elementUI: {
                  name: 'chunk-element3', // split elementUI into a single package
                  priority: 20, // the weight needs to be larger than libs and app or it will be packaged into libs or app
                  test: /[\\/]node_modules[\\/]_?element3(.*)/ // in order to adapt to cnpm
                },
                commons: {
                  name: 'chunk-commons',
                  test: resolve('src/components'), // can customize your rules
                  minChunks: 3, //  minimum common number
                  priority: 5,
                  reuseExistingChunk: true
                }
              }
            })
          config.optimization.runtimeChunk('single')
        }
      )
    if (process.env.NODE_ENV !== 'development') {
      config.plugin('html').tap(args => {
        args[0].cdn = cdn;
        return args;
      })
    }

  }
}
